LTC3787 Series

PolyPhase Synchronous Boost Controller with PassThru

Catalog

PolyPhase Synchronous Boost Controller with PassThru

Part	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Duty Cycle (Max) [Max]	Output Phases	Output Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Supplier Device Package	Package / Case	Frequency - Switching [Max]	Frequency - Switching [Min]	Mounting Type	Control Features	Topology	Function	Output Configuration
Analog Devices LTC3787HGN#PBF	150 °C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-SSOP	28-SSOP	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787IGN	125 ¯C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-SSOP	28-SSOP	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787HGN	150 °C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-SSOP	28-SSOP	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787IGN#PBF	125 ¯C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-SSOP	28-SSOP	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787HUFD#PBF	150 °C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-QFN (4x5)	28-WFQFN Exposed Pad	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787HGN#TRPBF	150 °C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-SSOP	28-SSOP	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787IUFD#PBF	125 ¯C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-QFN (4x5)	28-WFQFN Exposed Pad	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787EGN#PBF	125 ¯C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-SSOP	28-SSOP	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787EUFD#TRPBF	125 ¯C	-40 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-QFN (4x5)	28-WFQFN Exposed Pad	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive
Analog Devices LTC3787MPUFD#TRPBF	150 °C	-55 °C	2	96 %	2	Transistor Driver	38 V	4.5 V	28-QFN (4x5)	28-WFQFN Exposed Pad	760 kHz	105 kHz	Surface Mount	Current Limit Enable Frequency Control Power Good Soft Start	Boost	Step-Up	Positive

Key Features

• 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise

• Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation

• Wide VINRange: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up

• Output Voltage Up to 60V

• ±1% 1.200V Reference Voltage

• RSENSEor Inductor DCR Current Sensing

• 100% Duty Cycle Capability for Synchronous MOSFET

• Low Quiescent Current: 135μA

• Phase-Lockable Frequency (75kHz to 850kHz)

• Programmable Fixed Frequency (50kHz to 900kHz)

• Power Good Output Voltage Monitor

• Low Shutdown Current, IQ< 8μA

• Internal LDO Powers Gate Drive from VBIAS or EXTVCC

• Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3787 is a high performance PolyPhase®single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, enabling high power boost applications.A 4.5V to 38V input supply range encompasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3787 can operate from an input supply as low as 2.5V after start-up. The operating frequency can be set for a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL. PolyPhase operation allows the LTC3787 to be configured for 2-, 3-, 4-, 6- and 12-phase operation.The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode®operation, pulse- skipping mode or forced continuous mode at light loads.APPLICATIONSIndustrialAutomotiveMedicalMilitary